This excellent book is about deep wreck diving, submarines and how to solve a mystery! Well, it describes how the answer to one particular mystery was pursued with voracity! ‘Shadow Divers’ was a departure from my normal reading genre by a long way. It is a factual novel that contains information gleaned from a considerable amount of research on the people and the subjects at hand. Although this is the case, it is still very readable and you can easily forget it is non-fiction when you look at the lengths these guys went to in the search of answers and adventure, they really are crazy! I really enjoyed this book and as such will consider similar titles in the future.